US938480A - Type-writing machine. - Google Patents

Description

J. A. HAGERSTROM. TYPE WRITINGVMAGHINE. APPLICATION FILED SEPT. 25, 1907.

p Pgtentedlqov. 2, 1909.

4 SHEETS-SHEET 1.

WRNE rs ED SEPT. 25, 1907.

Patented Nov. 2, 1909.

4 SHEETS-SHEET 2.

sagsmr.

WIT 53353 I it J. A. HAGERSTROM. TYPE WRITING MACHINE. APPLICATION FILED SEPT. 25, 1907.

Patented N012, 1909.

4 SHEETEwSHEET s lNVENTOH aJA W/TNESSEiS J. A, HAGERSTROM. 7' I TYPE WRITING MACHINE.

APPLIUATION FILED SEPT, 25, 1907- 938A8Q, Patented N012, 1909.

4 SHEETS-SHEET 4.

l uB-mmaa ITED STATES PAEENT ()FFICE.

JOHN A. HAG-ERSTEOM, F BROOKLYN, NEW YORK, ASSIGN'OR 'IO VICTORTYPEWRITER COMPANY, OF NEW YORK, Y., A COBPORATIONOF NEW YORK.- 1.."

TYPE-WRI ING MAcHiNE.

Specification'cd. Letters Patent.

Patent-ed Nov.

Application filed September 25, 1907. Serial No. 394,436. 1

To all whom it may concern:

Be it known that I, JOHN A. HAGERSTROM, a citizen of the United States, anda resident of the borough of Brooklyn, county of Kings, and State of New York, have invented'a new and useful Improvement in Type-lVriting Machines, of which the following is a specification. v

My invention refers broadly to escapement mechanism and in particular to the arrangement of the dogsby the oscillation of which the escapement wheel performs its step by step motion, causing in turn by this motion the dogs tomove positively as required.

Furthermore, my invention relates to. a

'particular arrangement of the operating dogs by' means of which theescapement wheel is caused to perform its forward motion equal to the distance between two teeth in two steps, a smaller and a larger step, or a larger and then a smaller step,'atwill.

My invention is illustrated in the accompanying drawings in which- I Figure 1 is a rear view of typewriting machine showing the location of the escapemen't mechanism. Fig. 2 is aside view of the machine. Fig. 3 is an enlarged detail view of the escapement mechanism. vFig. -4 is a View at right angles thereto. Fig. 5 is a sectional view of Fig. .3 on line 5--5 Fig. 6

.is a sectional view of Fig. 3 on line 6-6.

Fig. 7 is a diagram, indicating the relative position of the two dogs and the two teeth of Fig. 3 in plan view. Fig. 8 is a modification of Fig. 3.. Fig. 9 is a view at right angles thereto. Fig. 10 is a modified form of Fig. 9. Fig. 11 is a sectional view of the cross section .on line X-X of Fig. -8. Fig. 12 is a modification of the dog structure-shown in Fig. 10.. I v

In Figsl and 2,10 is a rocking lever sultably pivoted in the machine frame at 9 and operated by the push and pull rod 11 from the universal bar 12 of the machine. The escapement mechanism which is operated by rocking lever 10 and shown in full view Fig. .1, isillustrated in Figs. 3 and 4 in detail and in enlarged seale As may be seen from thesefigures, lever 10 is U-shaped at its upper end, which is shown also in cross section, on lines 5 -5 and 6-6 respectlvelyin Figs. 5 and 6. Within this U-shapedhead are pivoted dogs 13 and 14; dog 13 by-pivot' pin 15 as a lever of the first order and dog 14 by means of pin 16 as a lever of the secondorder. Furthermore, the throw of. dog 14 is limited by having pivot 15 pass through the opening 17 of this dog. Dog'13 isguide d at its lower end by pin 18 in a recess 19 provided in dog 14 so that when dog 14 is moved in one direction dog 13 will 'be'positively moved in the other directionl'. The

upper ends of dogs. 13 and 14fare suitably shaped to engage the-teeth 20'ofesca'pementwheel 21 which may be suitablyjournaled and disposed in the machine frame; and

driven in any wellknown mannerusedin this kind of'machineL It'will be seen'that wheel 21 thus forms the'spacedfl'rnemjber of the'escapement mechanism, while' rocking lever'10 with its dogs forms the detaining and'spacing member of the mechanism. t

In Figs. 3 and 4 tooth 20 is shown "in engagement with dog 14, just having thrown this dog the farthest to the left on its rotation indicated by the arrow in Fig.3. This has caused dog 13 to move the farthest to the right. If now rocking lever 10 is rocked in the direction shown by the arrows in'F ig'. 4 tooth 20 willsl'ide off dog 14' and on dogia throwing this dog the farthest to 'the left,

which will cause dog 14 owing to its connection with dog 13 above describedfto be thrown the farthest to the rightas far as opening 17 will allow. In slidingfwith one tooth from dog 14 to dog 13 wheel'21 has made a' small step forward. If now rocking lever 1() is moved opposite to the direction indicated by the arrows the tooth 20 now-in engagement with dog 13 will slide off this dog behind dog 14 and be free so as to cause wheel 21 to move in the direction of the arrow. In the meantime do 14 has come by the same rocking motion of lever 10 into the path of'the next tooth, which will-strikeiit,

thereby also throwing dog 13, which. is now free to move, in the opposite direction until dog 14 is stopped'by pin 15 in opening 17' causing the wheel to perform a large step, whereafterfboth dogs assume again-the pos1- tion shown in Fig. 3, ready for the next cycle of'mo'vements as described above... The dimensions of the throw and movement of both dogs are proportioned so that when dog113, is thrown the farthest to the {rightiits face-. stands slightly behind thatof dog 14' is then thrown the farthest to the left (Fig.

3) This will facilitate the toothjin engage-.

ment with dog '14 to slide off this do and on d'ogi 13. Furthermore the throw o ,uog 14'.

to.the right is far enough to allow a tooth in engagement with dog 13-to slide between dogs '13 and 14 when lever 10 is rocked opposltely to the direction shown by the arrows in Fig. 4.

7 shows diagrammatically the instant at which rocking lever 10 is about to move in the direction of the arrow shown in Fig. 4 in order tocause-tooth 20 to slide off dog 14 and on dog 13. Owing to their connection with each other, the relative movement of the two dogs is so, that when a tooth, in the at rest posltion of the machine in engagement with dog 14, slides off this dog and on dog 13, always a small step is performed by wheel 21, and on sliding ofi dog 13 and at the same time on engagement of the next tooth with dog 14 always a large step is performed by wheel 21, the sum of both steps.

being equal to the forward movementiof the carriage one full letter space. Rocking lever 10 is disposed in the machine so that escapement wheel 21 performs its small step when any of the keys of the machine is pressed down, and the larger step when this key is released by the operator; the sum of these two steps-being equal to the distance'between two teeth -of Wheel 21 or also equal to the forward movement of the carriage the full space Of one letter as'stated already. The arrangement of moving the carriage the space of one letter in two unequal steps, the small step when a key is ressed down and the large step when this ey is released, is commonly used in typewriti-pg machines for writing at an average speed. It is well known that it is more advantageous for very fast writing, to have the carriage and thus the escapement wheel perform the large step when the ke is pressed down, and the small step when t e key is, released. In order to obtain this reverse sequence of steps whenever desired by the operator I have provided the following means w ich are illustrated in Figs. 8' to 12.

As shown in Figs. 8 and 9, 10 is the rock- 7 ing lever operated from the universal bar as described before. The U-shaped head 22 which carries the dogs forms a separate part which is fastened to'the upper end of lever 10 by means of a thumb-screw 23 so that it may. slide transversely to the longitudinal axis of leverlO in a direction transversely to the plane of rotation of wheel21 on an incline, the purpose of which will be explained later on. Within the U. shaped head 22 are pivoted do s 14, 13 and 14 (F1 .9). Dog 13 is-pivote again as a lever o the first order by means" of pivot pin 15, while dogs 14 and 14 (in Fig. 8 only dog 14 can be seen) are pivoted as levers of the second order by means of pivot-pin 16, to which both dogs are fixed in line with each other so that they will at any time perform their motion together. Furthermore dog 13 is spectively. The throw of dogs 14 and 14 is limited-in a similar manner as shown in Fig; 3 by having pivot pin 15 of dog 13 passing through openings, '17 and 17" of do 14 and 14" respectively.- The purpose of aving three dogs is to enable the 0 erator to o erate either with do 13 an 14 or with dbgs -14 and 13 at W1 by sliding the U-shaped head 22in slot 24 either to the left or to the right. Fig. 9 shows the U-shaped head 22 in a positionto causev dogs 14 and 13 to control the step by step movement of escapement wheel 21. One of its teeth 20 is at the time abutting against dog- 14 which has been thrown farthest to the left (in a similar manner as shown in Fi 3) and thus caused dog 13 to move the arthest to the right -(Fig. 8).- If now by operating rockinglever 10, head 22 is rocked to the right (F i 9), the tooth abuttingagainst' dog 14 wil slide off do 14 and on dog 13- causing wheel 21 to per orm a small step in the same manner as described before with regard to Fig. 3. If now rocking lever 10 is rocked in opposite direction, tooth 20, now

in engagement with dog 13 will slide '01? this'dog, escape behind dog 14 and be free so as to cause wheel 21 to move forward until the next tooth abuts against do 14, I

which has been moved by the same roc ing motion of lever 10 into the path of this tooth as described before. This will cause dog 13 to move oppositely to the direction in which the teeth approach the dogsand back into the position shown in Fig. 8 which shows the device when the machine is at 2 1 will be slightly behind i that of do 14 in the direction of the arrow shown in ig. 8 so that when U -shaped head 22 ,is moved tothe left by rocking lever 10 (Fig. 9) the tooth in engagement with dog 14 will easily slide off this dog and on dog 13, in the same manner as described before.

Assuming now that in operating with dogs 13and 14, rocking'lever 10 is disposed in the same manner as described with regard to Fig. 3, so that by depressing one of the keys 20 of the machine, a tooth in engagement with dog 14' will slide off this dog and on dog 13 andby releasing the key, the. tooth now in-jengagement with dog 13 will be freed and thus the escapement wheel will make first'its small step and then its large step, the sum of which is equal to one letter space of the platen movement. This would be the position of the escapement device suit able for writing at ordinary speed. If now head 22 is shifted on rocking lever 10 to the of escapement' wheel 21 and it is evident that wheel" 21 will make its larger step on depressing akey of the machine and the smaller step on releasingthe'key, since now the rocking ofhead 22 to the left will cause a tooth in engagement with dog 13 to be freed and thus the wheel 21 to perform the larger step while formerly a rocking of lever 10 to the left caused a tooth to slide from dog 14 to 13 and thus the wheel to perform l a small step.

It has been stated before that the position shown in Fig. 8-, that is with a tooth resting on dog 14 is the position which shows the device at rest and set for writing at ordinary speed. If nowthe operator desires to adjust the' device for fast writingby shifting head 22 on lever 10 to the left (F 1g. 11), the tooth in engagement with dog 14 will be caused to slide off this dog and on dog 13 on'which it now stays when the machine is at rest. This has caused wheel 21 to per-. form a small step unintentionally and so in turn the carriage to-move a small ste forward in the writing direction. If this adjustment is made for instance by the oper- 'ator' at the beginning of anew line, several other lines being written with the device set for slower writing, this new line will not commence with the s'ame'margin as the other lines written but will have a margin-which is larger by the space of a small step of the carriage. This small step could not be compensated by the operatorby shifting the carriage back, since the carriage of machines commonly used can be shifted in either direction only a full letter space. 'In order to compensate for this lost small step head 22 is shifted on lever 10 on a surface 25 inclined at a suitable angle to the shiftin direction (Fig. 11). If now head 22 is sh fted from the right to the left inorder to set the device for fast writing as described above head 22 will move-at the same time in the direction indicated by the arrow in Fig. 11, which will bring the face of dog 13 on the same line on which the face of dog 14 is shown in engagement with dotted tooth 20. By this arrangement is obtained, that the tooth formerly in engagement with dog 14 has been caused to'slide on dog 13 without: causing the escapement 'wheel to perform a step, against whichdo'g thefte eth of wheel '21 now hear when the machine is at rest. On the other hand if the device is to be shifted from the position described- 'above back into 'theposition shown in Fig.- 11 in orderto set'the machine from fast writing back to slow writing a tooth 2O nowresting on dog 13 as described will slide off this dog and escape behind dog v 14 the next tooth now bearing against'dog 14 thus causing the.-

wheel to perform a large step. which is actu ally lost. But since head 22 is now being shifted down the incline 25 back into the position shown in Fig. 11 also a small step will be lostwhich in addition to the lost 1 lar e step is vequal to one full letter space which the wheel has caused the carriage to move forward in the writing direction when the device isv set from fast writing back to .slow writing. This lost space may now be .Fig. 10.

In the structure shown in this figure two dogs 13 and 13 are pivoted as levers of the first order and coupled together by means of pin 18 forming their point of application, while only one dog 14 pivoted, as a lever of the second order is provided and disposed between dogs 13 and 13 'The throw of this lever is limited in the same manner as shown in Figs. 8 and 9 by pin 15 passing through opening 17 of dog. 14.

while the point of resi-stance'of this dog is also located as shown in Figs. 8 and 19' by pin 18 passing through guide slot 28, I-n

. this modific ation the teeth of hen 2 1.would abut when at rest normally, when the device is set for slow writing, against the middle dog 14, while in' case of fast writing the teeth'will abut when at rest against the outer dog 13 as shown in Fig. 10. r

Furthermore another modification may be ,made without departingfrom the spirit of my invention by having the dogs in Fig. 12 disposed relatively to each other as shown in Fig. 9 but the dogs 14-and 14? made in one U shaped piece which is pivoted in head 22 by means of pivot screws 26 while the pin 18 shown in Fig. 9 fastened to dog 13.may be divided into two pieces 18 and 18 fastened to dogs 14 and 14 respectively and engaging in recesses 27 and 27 respectively provided in dog 13 and forming its point of application. 7

While I have shown way of illustration an' escapemenjt. wheel as the movable [or spaced escape-merit member, it is evident that any other well known form of movable or spacedescapement member, such as, for an;

stance a straight rack, of w-hich the. escape ment wheel 21 illustrated is only a curved, varlety, may be used 1n connection with my nnproved escapemen't' mechamsm, without departing from the spirit of my inventiont I} Icla im z v '1. In an escapement mechamsm, the corn each tooth of said w the throw of said dogs.

bination' with an escapement wheel tending to rotate in one direction, a vibrating member disposed to operate transversely to the plane of rotation of said wheel havin two dogs engagin each tooth of said whee successively,- said dogs interconnected to cause one dog when moved b said wheel to positively move the other 0 oppositely to the direction of rotation '0 said wheel, and .meansfor limiting the throw of said dogs.

2. In an escapement mechanism, the com-.

bination. with an escapement wheel tending to rotate in'one direction, a lever disposed, to rock transversely to the plane of rotation of'said wheel, having two dogs engagin v eel successively, sai dogs interconnected to cause one dog when movedby said wheel to positively move the other dog oppositely to the direction of roi tation of said wheel, and means for limiting 3. In aueScapement mechanism the combination with an escapement wheel tending to rotate in one direction, a vibrating mem ber disposed to operate transversely to the plane of rotation of said wheel havin twodogs engaging each tooth of said whee successively, the first dog pivoted as a lever of i the second order at one of its ends, the secmoving said second dog to rocli transversely to the plane of rotation pivoted as a lever ofthe second order at one of said wheel having two dogs: engaging each tooth of said wheel successively, the first dog ofii'a ends, the second dog pivoted as a lever of the first order intermediate its ends, said -first :iog having operative engagement intermediate its ends with the actuatlng end of said second dog, said first dog when moved by said wheel moving said second dog positively opposite to the direction of rotation of said wheel and said second dog when moved by said wheel moving said first dog in said opposite direction and means for limiting the throw .of said dogs.

5. In an escapement mechanism, the combination with an escapement wheel tending to rotatein one direction, a vibrating 1ne1nher dis osed to operate transversely to the plane 0 qrotation of said wheel, having two dogs fixed together and a third dog pivoted between said-twodogs, said inner dog and said outer dogs interconnected to cause said wheel when movm the inner dog in one direction to throw t e outer dogs positively in the opposite direction ofits rotation, and when moving either of the .outer dogs to throw said inner dog positively in the op 0- site direction of its rotation, and means or limiting the throw ofsaid dogs.

6. In an escapement mechanism, the combmation with an escapement wheel tending to rotate in one direction, a lever disposed to rock transversely to the plane of rotation of said wheel, having two dogs fixed to ether and a third dog pivoted between sai two dogs, sa d mner dog and said outer dogs interconnected to cause said wheel when move ing the inner dog in one direction to throw the outer dogs positively in the opposite direction ofits rotation, and when moving either of the outer dogs to throw said inner dog positively in the o posite direction of its rotation, and means flir limiting the throw of said dogs.

7. In an escapement mechanism, the combination with an escapement wheel tending 'to rotate in one direction, a vibrating member d sposed to, o'perate'transvers'ely to the plane of rotation of said wheel, having two dogs fixed together and a third dog pivoted between said two dogs, said inner dog and said outer dogs interconnected to cause said wheel when moving the inner dog in one direction to throw the outer dogs positively in the opposite direction ofits rotation, and when moving either of the outer dogs to throw said inner dog positively in the opposite direction of its rotation, means for limiting the throw of said dogs, and means causing the teeth of said wheel to cooperate with the inner dog and either of the outer dogs at will.

8. In an escapement mechanism the com- I bination with an escapement wheel tending to rotate in one -direction, a vibrating member disposed to operate transversely to the plane of rotation of said wheel having two dogs fixed together and a third d pivoted between said two dogs, said outer ogs pivoted as levers of the second order at one of their ends, said inn'ercdog pivoted as a lever of the first order intermediate its ends, said outer dogs having operative engagement intermediate their ends with the actuating end of said innerdog, said wheel when engaging and throwing each of the outer dogs in one.

direction causing the inner dog to move positively in the opposite direction of its rotation, and when engaging and throwlng the inner dog in one direction causing said outer dogs to move in the opposite direction and means for limitingthe throw of said dogs. I

9. In an escapement mechanism thecombination with an escapement wheel tendm to rotate in one direction, a lever disposed to rock transversely to the plane of rotation of said wheel having two dogs fixed together and a third dog pivoted between saidtwo dogs, said outer dogs pivoted as levers ot' the second order at one of their ends, the inner dog pivoted as a lever of the first orderinterinediate its ends, said outer dogs having operative engagement intermediate their ends with the actuating end of said inner dog, said wheel when moving and throwing one of the outer dogs in one direction causing the inner dog to move positively in the opposite direction of-its'rotation, and when aengagmg and throwing the inner dog in one direction causing said outer dogs "to move in "the opposite direction and means for limit- :Iing'the throw of said dogs. t: 10. In an escapeinent mechanism, the 'ibinationwith an escapeineiit wheel tending cointo rotate in one direction, a vibrating member disposed to operate transversely to the plane of rotation of said wheel, having two fwhen engaging and moving either of the titer dogs to throw said inner dog posrdogs fixed together and a third dog pivoted between said two dogs, said outer dogs pivoted as levers of the second order atone ot' their ends, said'inner dog pivoted as a lever of the first order intermediate its ends, said outer dogs having operative engagement iii- -terinediate their ends with the actuating end bination with an escapement wheel tending to rotate in one direction,-a vibrating member disposed to operate transversely to the plane of rotation of said wheel, having two dogs fixed together and a third-dog pivoted :between said two dogs, said inner dog and "SfllCl outer dogs interconnected to caiisesaid wheel when moving the inner dog 1110116 direction to throw the outer dogs positively in the opposite direction of its rotation, and

" tively in the opposite direction of its rotaplane of rotation of said dogs causing the *teeth of said wheel to'rooptral'e with the iiition, means for limitingthe throw of said dogs, and a slide disposed on said vibrating member to be shifted transversely to the *iier dog andeit'her oftheiiuter dogs at-will.

rook transversely to the plane of rotation said wheel, having twodogs fixed toge tl jer and a third dog pivoted between said in an escapeinent niei-hanisin, the ro'in "bllltltlOll with an escapeinent wheel tending #to rotate in one dircctioii a lever disposed" two dogs, said inner dog and said outer dogs interconnected to cause said wheel when engaging and moving the inner dog in one direction to throw theouter dogs positively'in the opposite direction of itsrotation, and when engaging and moving eitherofthe outer dogs to throw said inner dog posi tively in the opposite direction of its'rotation, means for limiting the throw ofsaid dogs, and a slide disposed on said rocking lever to be shifted transversely to the plane of rotation of said dogs causing the teeth of said wheel to cooperate with the-inner dog and-either ofthe outer dogs atwill.

13. Inan escapement mechanism the :combination withan escapenient wheel tending to rotate in one direction, a vibratingmem ber disposed to operatetransversely to. the

[plane of rotation of said wheel having two dogs fixed together and a third dog pivoted between said two dogs, said outer dogs pivoted tIS' lQYGlS of the secondorder atone ot' theirends, the inner dog pivoted as a lever of the first orderintermediate its ends,'said outer dogs having operative engagement intermediate their ends with the-actuating end of said inner dog, said wheel when engaging and throwing one of the outer dogsin one direction causing the inner dog to move positively in the opposite direction of its r0- tation, and when engaging and throwing the inner dog in one direction causing said outerdogs to move in the opposite direction, means for limiting the throw of said dogs and a slide disposed on said vibratingmember .to be shifted transversely to the planeofrotation of said wheel-bearing the pivots of said dogs, causing the teeth of said 'wheel' to cooperate with the-inner dog and either of the outer dogs at will. 1

ll. In an escapeinent' nieclianisni-t-he coinhination with an escapeine it wheel tending to rotate in one direction, a lever disposed to rock transversely to the plane ot'rotation of said wheel. having two dogs fixed"to gether and a third dog pivoted betweeirsaid two dogs,,said outer dogs pivoted as levers ot' the second order at one of their ends, the inner dog pivoted as a lever ot-th'e first-order intermediate its ends, said outer. dogs having operative engagement intermediate 1 their "ends with the actuating end (if-said inner dog. said wheel when engaging and throwing one of the outer dogs in'o'ne direction causing the inner dog to move positively in the opposite direction of its 1Ultl l lOIl, and I when engaging and th'r \\'ing the inner dog in one direction cansingsaiijl 'o-iiter: dogs to inov'e in the opposite direction, iDlBitllS'fOI liniiting the throw'ol said dogs,.-a id-a' slide disposed on said rocking leverto' be shifted l liil"iis\ei"sel;\ to the plane ot'" rotation o'f said dogs causing the teeth of saidewheel; to cooperate with'the inner dog and eitliei'w'ottli'e? outer dogs at ,will.

15 In an escapement mechanism, thecombination with an escapement wheeltending to rotate in one direct on, a vibrating member disposed to operate transversely to the plane of rotation of said wheel, having two dogs fixed togetherand-a thirddog pivoted between said two vdogs, said inner dog and said outer dogs interconnected to cause said wheel when engaging and movingthe. inner dog in onedirection to throw the outer dogs positively in the opposite direction of its rotation, and when engaging and moving either of the outer dogs to throw said inner dog positively in the opposite direction of its rotation, means for limiting the throw of said dogs, and a slide disposed on said vibrating member to be shiftedtransversely t0 the plane of rotation of said dogs causing the teeth of said wheel to cooperate with the inner dog and either of the outer dogs at will, and means for. compensating for the.

' steps lost by said shifting motion.

16. In an escapement mechanism, the combination with an escapement wheel tending to rotate in one direction, a vibrating member disposed to operate transversely to the plane of rotation of said wheel, having two 'dogs fixed together and a third dog pivoted between said two dogs, said inner dog and said outer dogs interconnected to cause said wheel when engaging and moving the inner dogin the direction to throw the oiiter dogs ing member to be shifted at a suitable angle to the plane of rotation of saidwheel, causing when shifted the inner dogand either of the outer dogs to cooperate to control the step by step motion-of said wheel'at will and to compensate for the step lost by said shifting'motion. y

=17. In a typewriting machine the combination of a spaced member having teeth and a detaining member and means for'moving one of said members at right angles to the direction of movement'of the spaced mem-' ber, said detaining membercomprising two dogs engaging each tooth of the. cooperat ing escapement or spaced member successively, said dogs interconnected to cause one dog when engaged and moved. by said teeth to positively move the other dog oppositely to the said direction of movement and means for limiting the throw of said dogs];

w '18; In a typewriting machinethe combi- 1 nation of a spaced member havin teeth and a detaining member and means or moving one of said members at right'angles to the direction of 'movem'ent'of the spaced memb nation of a spacmg .escapement memben ber, said detaining member comprising-two ing said -,change in oofip'eration.

dogs engaging each tooth of the coas me ing escapement or spaced member successively, said dogs interconnected to cause one dog when engaged and moved by said teeth -.to positively move the other dog oppositely to'the said direction of movement, the alternate engagement of said dogs causing the escapement mechanism to perform'long and short steps successively, and means for limiting the throw of said dogs. I

19. In a-typewriti'ng machine the combination of a spacedmember havin teeth and a detainin member and means" or moving one ofsai members at right angles to the direction of movement of the" spaced memher, said detaining member comprising three dogs suitably pivoted and disposed. to cause each tooth of 1ts coiiperating member to co-,

operate with the inner dog andeitlier of the other dogs, said inner dog and said outerdogs intexconnected'to cause a tooth engaging and moving the inner dog to throw the outer cooperating dog positively opposite to the direction. ofmovement and when engag-.

ing and moving either of the outer do to throw the inner do positively-in sai o posite direction,,-an means -for limiting t e throw of saiddogs,

dogs suitably, pivotedandinterconnected to 'cause the teeth ofsaid s aced member to cooperate with .the inner... og and either of the outer dogs, the coiiperation of said inner dog with one., o f said outer dogs' causing said spaced member toI'perform' alternatel long -.and short steps, the coope ation of sai inner dog with the other 'of'said outer dogscaus ing saidfspaced' -me'rnber'. to perform alternately short and long steps, and means caus- 21; In an escapement mechanism, the combination of 'a spacing escapement member, movable in one direction, and a detaining escapement' member ada ted to vibrate transversely to the'direction of movement of said movable member, having'a slide disosed to be shifted on said vibratin member in said transverse direction said side having three dogs suitably pivoted and disposed to cause the teeth of said movable member to cooperate with the inner do and either ing said movablememberto rform alternately long and short steps, e coiiperation of said inner dog with the other of said outer dogs causin' said movable member to perform alternate y short [and long steps;

22. In an escapement mechanism, the com- 20.- Ina typewritin'g machine the combination of a spaced member havin teeth and a detaini "of the outer dogs, the-cobp'era ion of said} I inner dog with one of said outer dogs cansmovable in one direction, and a detaining nieinbenadapted to vibrate transversely to the direction of movement-of said movable member, having a dog adapted to perinanently cooperate with the teeth of said movable memberand two dogs adapted to selectively cooperate with the teeth'of said movable member, the cooperation of said permanently operating dog with one of said selectively operating dogs causing the escapeineut mechanism to perform successively first a long and then a short step, the cooperation of said permanent operating-dog with the other of said selectively operating dogs causingsaid escapelnent mechanisinito perform sue-- "JOHN A. HAGERSTROM.

Witnesses:

G. V. CAMPBELL, A. L. CAMPBELL.

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